First, let's see if there are any tiny particles attached to the spout of the watering can. If there is, we can pick out the particles with a needle. Check whether the nozzle is sunken or not: it is easy to sink if the nozzle is pressed for a long time and cannot be restored to its original state. We can twist it first, then pull it out and pull it back to its original position.
Rotating nozzle: the nozzle in one direction for a long time may also be the reason why the watering can does not spray. The nozzle can rotate 360 degrees. We can turn it left and right to see if we can use the spray again. Shake the watering can: when the liquid in the spray is left standing for a long time, the liquid in the bottle is unevenly distributed and cannot be sucked out by the straw below. Try shaking the spray up, down, left and right to make the watering can spray liquid.